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I PATENTED JAN. 13, 1903.

'IL L. MEYER. PURNACE.

APPLICATION FILED APR. Z4, 1902.

No MODEL.

PATBNTED JAN.'13, r190si v No. 718,497.

H. L. MEYER,

' PURNAGE.

APPLICATION FILED APR. 24,'1902.

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UNITED VSTATES PATENT OFFICE.

HERMAN Il. MEYER, OF ST. PAUL, MINNESOTA.

FU RNACE.

SPECIFICATIQN forming part of Letters Patent No. 718,497, dated January 13, 1903. Application iled April 24, 1902. Serial No. 104,427. (No model.)

To all whom it may concern:

Be it known that l, HERMAN L. MEYER, a citizen of the United States, residing at St.

-Iaul, in the county of Ramsey and State of preventing the formation of smoke, as with ordinary furnaces now in use.

Thisinvention relates more particularly to that class of furnaces in which a stationary boiler is used and in which the draft is supplied by a current of air entering the {ire-box. Myinvention consists ofthe following parts, as hereinafter specified and claimed.

In the accompanying drawings, forming v. part of this specification, Figure l is a longitudinal section of my invention. Fig. 2 is a section taken on the line X X of Fig. 1 looking toward the front of the boiler. Fig. 3 is a detail section showing the front of the boiler and one of the partitions between the flues. Figs. 4, 5, and 6 are detail views showingthe method of constructing the partitions.

In the drawings, let A represent a boiler having the longitudinal flues 2.

B represents the furnace, having the brick walls S and 4, upon which the boiler is supported by means of the flanges 5 and 6 and the brackets 7 and 8. The flanges extend the entire length on each side of the boiler. The fire-box C is provided with the fire-grate D, to be hereinafter more particularly described. Fuel is supplied to the fire-grate through the door 9, and the ashes may be removedfrom the ash-pit 10 through the door 11. A draft-opening 12 enters the ash-pit below the grate through the wall 3. The bridgewallEis positioned at the rear of the grate and below the boiler, so as to form the passage-way F for the products of combustion from the fire on the grate. The space between the front end 13, adjoining the rear of the lire-grate, and the back end 14, near the rear end of the boiler, is filled with sand and covered byafacing of firebrick 15. The objectof the bridge-wall is to form 'the passage-way F, so as to confine the heat from the furnace in the passage-way close to the boiler and 1o contain residual heat when the furnace is operated, so that should the fire die down or go out the boiler will be supplied with heat for a considerable time from the bridge-Wall. The front end 1-3 of the bridge-wall projects at 16 above the facing l5, and a plurality of air-inlet pipes 17, leading from below the lire-grate in the ash-pit to above the facing 15, back of the projecting portion 16, as shown in the drawings,'are adapted to assist combustion of the unconsumed products from the fire by feeding air from the inlet 12 to the passageway F.

A dividing-wall G at the rear of the boiler, as shown in Fig. 1, is adapted to direct the draft from the furnace through the lower portion 18 of the boiler-dues. This dividing-wall is hinged by means of the shaft 19, which is journaled in the walls 3 and 4 of the furnace. A corresponding dividing-Wallis provided atthe front'end of the boiler and is also hinged by meansoftheshaft20inasimilar-manner. The frontdividing-wall directs the draft from the lower flues 18 into the longitudinal passageways I and J, extending along the sides of the boiler and connecting with the upper p0rtion 21 of the flues at the rear end of the boiler. These longitudinal passage-ways I and .I are formed in the brickwork of the boiler-furnace immediately below the flanges 5 and 6 and have inlets at 22 and outlets at 23 for the draft. The draft continues from the passageways through the upper set of flues 21 and out by means of the chimney I at the front end of the boiler. This chimney, as shown, is provided with the damper 24, so that the draft can be regulated in the chimney when desired. The inlet passage-way 12 is also provided with a damper 25 for regulating the inlet of air into the furnace. It is obvious that a forced draft may be used when desired. Y

The dividing-walls G and H are constructed with a reverse curve, as shown in the drawings. of the wall, is protected against damaging effects of the heat from the fire by means of a facing of lire-bricks 27, as shown. The bricks are fastened to the plate by means of the T- shaped ribs 28 on the lower surface 29. The bricks are indented at 30, so as to engage the The metal plate 26, forming the back.

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T-shaped ribs, and are held from sliding off the ribs by means of the clips 3l on the plate. By reference to Figs. 4, 5, and G the construction of the dividing-walls may be followed. The shafts 19 and 2O ofthe dividingwalls are provided, respectively, with the handles 32 and 33 (see Figs. 2 and 3) for the purpose of turning the dividing-walls. The object of curving the plates 26, as shown, is for the purpose of-dumping waste products of combustion that collect on the surface of the dividing-walls by turning the handles.

To more completely consume the waste products of combustion inthe furnace,I have also provided a pair of air-inlet pipes 34 and 35, which rise vertically through the brick walls of the boiler-furnace from the ash-pit to the front ends of the longitudinal passageways I and J. These pipes are adapted to feed air into the longitudinal passage-ways.

As shown, the grate is constructed of longitudinal bars 3l, which are adapted to rest on the shoulders 37 and 38. This portion of the grate is of ordinary construction. I preferably provide the open-grate-work sections 39 on each side and at the rear of the gratebars 3G. These sections incline upward from the bars 36, as shown in the drawings. The fire is preferably built on the grate-bars 3G and the grate-sections 39 left open, so that air is free to circulate around the lire to more completely aid combustion of the fuel.

Having described my invention, what I claim as new, and desire to protect by Letters Patent, is-

l. A boiler-furnace having a grate, a bridgewall at the rear of said grate, forming a passage-way between its upper surface and the lower surface of the boiler, a plurality of airinlet pipes communicating with said passageway, a dividing-wall connecting said passageway with the rear ends of part of the boilerfines in the boiler, a corresponding dividingwall at the front end of the boiler, a passageway on each side of the boiler connecting the front ends of said portion of lines with the back ends of the remaining portion of fines, an air-inlet pipe leading to each of the side passage-ways, and means for regulating the supply of air through said inlet-pipes; all of said air-supply pipes adapted to discharge air to mingle with the products of combustion in the passage-ways.

2. In combination, a boiler having a plurality of sets of flues and a communication exterior to said boiler and between the ends of said sets of flues, for the purposes specified.

A boiler-furnace having a grate, an airinlet below said grate, a bridge-wall at the rear of the grate,means for admitting air from said inlet below the grate into the passageway formed by the uppersurface of the bridgewall and the lower surface of the boiler, a dividing-wall between the upper and lower iues at the rear end of the boiler, a corresponding dividing-wall between the upper and lower iiues at the front end of said boiler, and passage-ways leading from the flues below the corresponding dividing-wall to the back end of the ues above the rear dividing-wall.

4. A boiler-furnace having an ash-pit, a grate above said ash-pit, a bridge-wall at the rear of the ash-pit and grate, positioned so as to form a passage-way close to the lower surface of the boiler, an air-inlet below the grate, means for admitting air from said inlet below the grate to said passage-way, a system of dividing-walls between the lues of the boiler, and a passage-Way exterior to said boiler and connecting the opposite ends of the flues separated by said system of dividing-walls.

5. A boiler-furnace havinga grate,a bridgewall at the rear of said grate forming a passage-way between its upper surface and the lower surface of the boiler, a system of dividing-walls arranged between the flnes at each end of the boiler, communications outside the boiler which connect the opposite ends of the sets of lines, and air-inlet openings in said communications.

6. A boiler-furnace having a grate,a bridgewall at the rear of said grate forming a passage-way between its upper surface and the lower surface of the boiler, dividing-walls arranged between the fines at each end of the boiler, and a longitudinal passage-way on each side of the boiler communicating the lower set of fines at the front end of the boiler with the upper set of tlues at the opposite tend, for the purposes specified.

- f `7|. A boiler-furnace having a grate,a bridgewall at the rear of said grate, dividing-walls arranged between the ilues at each end of the boiler, a longitudinal passage-way at the side of the boiler connecting the lower fines at the front end of the boiler with the upper fines at the opposite end, and means for admitting air into said longitudinal passageway to mingle with the products of combustion. 8. A boiler-furnace having dividing-walls between its lines at its opposite ends, and exterior means for communicating the lower flues at the front end of the boiler with the upper iues at the opposite end, for the purposes specified.

9. A boiler-furnace, having dividing-walls between its filles at its opposite ends, communications between the-lower fines at the front end of the boiler and the upperflues at the opposite end, and means for introducing air into said communications between said opposite ends of the boiler, for the purposes specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HERMAN L. MEYER.

fitnessesz JOHN E. STRYKER,

J. G. BRADBURY.

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